Process of soldering chain-links.



No Drawing.

UNITED $11 5 rare nuenn SPEIIDEL, or rronznnm, ennmni'assienon. TD "run rmm or rnmimren sPEmEL, or rronznnmt, GERMANY;

" rnocnss or SOLDEBING CHAIN-LINKS.

To all whom, it may concern:

Be it.known that I, EUGEN SPnionL, a

subject of the German Emperor, and residpurpose of preventing the links ,from be coming inter-soldered during the jointshutting operation. e The various processes now in usefor'continuously shutting the joints of solder cored Wire links result in moreor less waste, since in spite of the greatest care numerous links will be found finally to have become intersoldered, due to imperfect separation of the concatenated links from one another during the soldering operation.

According to one well. known process of this kind, the linkis first drawn through a deoxidizing agent and this latter removed again except from the faces of the joint where soldering is to take place; next a protective mass in powder form is applied,

'which is intended 'to work itself in between tive mass (caput mort zmm, graphite or the like), the latter is apt to drop out again leaving the seat portion unprotected, with resultant inter-soldering. Furthermore, particles of the protective mass are apt to enter in between not tightly closed links, thus preventing formation of a perfect solder joint: and the'applica'tion of such a protective powder is unclean and highly injurious to the health of the operators. And

as the particles of the protective mass do not.

always cover the surface perfectly, there being porosities and interspacedin such materials, there is apt to be formed little drops 7 Specification of Letters Patent. Application filed April 22,

1910. Serial 1%. 557,011; j

or globules of the molten metal on the unprotected sheath metal of the chainlink.

The object of the present invention is to obviate these drawbacks, hastening and cheapening the process and reducing the waste to a minimum. a I 1 In carryin out my improved process the work piece, or instance a concatenation of chain links, is first coated with a solution of a deoxidizing agent, such as borax, boracic the metal during the soldering operation; the solvent of this soldering agent is then "evaporated and the resulting crystals are m any suitable manner, for instance by shaking, rubbing or brushing the chain during or after thedrying process. I then produce on the surface of the work piece, in any or,sulfid or other chemical compound of one of the metals of thealloyof which the shell of the cored wire consists. Thus for example the oxid film. maybe produced by cont-acting the metal with sawdust saturated with a Weak solution of sulfuric, acetic or other acids, in the presence of air or oxygen, or the sulfid coating may be produced by means of a solution of liver of sulfur. Or alkalis, chlorids (such as chlorid of lime) and the like may be used-if necessary with the aid of the action of ligh'tto produce on the surface of the metal of the work material. a filmlike coating of a chemical compound of such metal suitable for the presentprocess. The'links are then subjected to high heat, when the solder fuses and the joints become shut; and the work piece is lastly cleansed in well known manner in alkali baths and by other means, and is 'then passed on for further operations. 7

The film of oxid or sulfid or the like produced in the described manner effectively prevents any of the solder which may ooze from the joint from spreading unto-adjacent links. There is no danger of a coating thus obtained scaling off or cracking during the ensuing operations, since such oxid or sulfid films are very tenacious and hard,- and even should there occur minor injuries to the protective film, they would afterward be covered up again by the oxidation ensuing during the soldering operation;

The filmlike coating of a metal compound oinmon.

removed except from the faces of the joints suitable manner, a thin layer or. film of oxid Patented r i.2o,1912.

acid, glass fluxes, sodic dihydric orthophosM phate, and the like, to prevent oxidation of produced on the Wire of the link in the present operation is very thin and 1s continuous; it is uniform and coextensive with the surface of the metal. And there is no tendency of the globules or drops of the molten metal to adhere to bare spots on the sheath metal, as is aptto occur in the prior art where separate compositions or substances Were mechanically applied. These mechanically applied compositions or substances are generally powders. and are discontinuous; the chemically applied coating is continuous.

What I claim is 1. Process of preventing inter-soldering of solder-cored metal chain links, consisting in applying a deoxidizer to-the Work piece, partially removing it again, and chemically producing on the surface of the metal of the Work piece an antisoldering filmlike coating of a compound of such metal, substantially as set forth, J

2. Process of preventing inter soldering of solder-cored metal chain links, consisting in applying to the work piece a deoxidizer, partially removing it again, producing on the work piece a film like coating of, an oxidized compound of the metal of the metal surface, and heating the workpiece until its core of solder melts and closes the joints, substantially as set forth. y

3. Process of preventing intersoldering of solder-cored metal chain links, consisting in treating the links With a deoxidizing agent, removing the latter again except from the faces of the joints, chemically produoin on the metal of the surface of the linksa' lmlike antisoldering coating of a compound of such metal, and then heating the chain to soldering heat, substantially as set forth.

4. Process of preventing inter-soldering of solder-cored metal chain links, consisting inapplying to the Work piece a deoxidizer, partially removing it again, chemically producing on the surface of the links a filmlike coating of acompound of the metal of which the links are made, and then heating,

the links to soldering heat with' the ends in vcoiitact, substantially as set forth.

5. Process of preventing inter-soldering of solder-cored metal chain links, consisting in applying to the work piece a deoxidizer, partially removing it again, chemically pro'-. ducing on the'surface of the metal of the links a compound of a metal component of the shell of the links, and then heating the links to soldering heat, substantially as set 

